Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Gianfranco Pradisi"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 2, Pp 1-16 (2024)
Abstract We study a class of early universe cosmological models based on Einstein–Cartan gravity and including a higher derivative term corresponding to a power of the Holst scalar curvature. The resulting effective action is basically given by Gen
Externí odkaz:
https://doaj.org/article/608808609e4b41cba3da182281a07ab6
Publikováno v:
Universe, Vol 10, Iss 7, p 284 (2024)
In this review, a pedagogical introduction to the concepts of slow-roll inflationary universe and number of e-folds is provided. In particular, the differences between the basic notion of number of e-folds (Ne), total number of e-folds (NT) and numbe
Externí odkaz:
https://doaj.org/article/404c986faf854b01adc0c887fe441bce
Autor:
Gianfranco Pradisi, Alberto Salvio
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 9, Pp 1-19 (2022)
Abstract In a geometrical approach to gravity the metric and the (gravitational) connection can be independent and one deals with metric-affine theories. We construct the most general action of metric-affine effective field theories, including a gene
Externí odkaz:
https://doaj.org/article/7b5f847b4e2046bfaa2dac639866b2c1
Publikováno v:
Nuclear Physics B, Vol 954, Iss , Pp - (2020)
The moduli space of toroidal type I vacua, which are consistent at the non-perturbative level, is composed of independent branches characterized by the number (0, 16 or 32) of rigid branes sitting on top of orientifold planes. This structure persists
Externí odkaz:
https://doaj.org/article/dacfcdeb67324e1cbac8e3eef4680786
Publikováno v:
Nuclear Physics B, Vol 930, Iss , Pp 155-194 (2018)
We analyse open strings with background electric fields in the internal space, T-dual to branes moving with constant velocities in the internal space. We find that the direction of the electric fields inside a two torus, dual to the D-brane velocitie
Externí odkaz:
https://doaj.org/article/ff8828c343d340d688c992c95b891072
We explore the consequences of a time-dependent inflaton Equation-of-State (EoS) parameter in the context of the post-inflationary perturbative Boltzmann reheating. In particular, we numerically solve the perturbative coupled system of Boltzmann equa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a92e7c332770355a1f8b121d7db14eda
http://arxiv.org/abs/2102.00326
http://arxiv.org/abs/2102.00326
Publikováno v:
Nuclear Physics
Nucl.Phys.B
Nucl.Phys.B, 2020, 954, pp.114976. ⟨10.1016/j.nuclphysb.2020.114976⟩
Nuclear Physics B, Vol 954, Iss, Pp-(2020)
Nucl.Phys.B
Nucl.Phys.B, 2020, 954, pp.114976. ⟨10.1016/j.nuclphysb.2020.114976⟩
Nuclear Physics B, Vol 954, Iss, Pp-(2020)
The moduli space of toroidal type I vacua, which are consistent at the non-perturbative level, consists of independent branches characterized by the number (0, 16 or 32) of rigid branes sitting on top of orientifold planes. This structure persists al
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b2fdfaec29ac32d4327523e230dbc9c2
http://hdl.handle.net/2108/281927
http://hdl.handle.net/2108/281927
According to the most popular scenario, the early Universe should have experienced an accelerated expansion phase, called Cosmological Inflation, after which the standard Big Bang Cosmology would have taken place giving rise to the radiation-dominate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4b799b843fbdd14dd668ddfce29c87e
Publikováno v:
Physical Review D. 100
We discuss the perturbative decay of the energy density of a non standard inflaton field $\rho_{\phi}$ and the corresponding creation of the energy density of the relativistic fields $\rho_r$ at the end of inflation, in the perfect fluid description,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb673d36c4e635cc579acc8be7f9b4bd
https://doi.org/10.1103/physrevd.100.123532
https://doi.org/10.1103/physrevd.100.123532
In this paper, we discuss the constraints on the reheating temperature supposing an early post-reheating cosmological phase dominated by one or more simple scalar fields produced from inflaton decay and decoupled from matter and radiation. In additio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b394663295fc2d2b67390415ee50ab3
http://arxiv.org/abs/1807.05916
http://arxiv.org/abs/1807.05916